diff --git a/main/inc/lib/agenda.lib.php b/main/inc/lib/agenda.lib.php
index e721627b27..1d5d3415f7 100644
--- a/main/inc/lib/agenda.lib.php
+++ b/main/inc/lib/agenda.lib.php
@@ -1456,7 +1456,9 @@ class Agenda
                     }
                 }
 
-                $this->loadSessionsAsEvents($start, $end);
+                if ($start && $end) {
+                    $this->loadSessionsAsEvents($start, $end);
+                }
 
                 break;
         }